Rock-drill.



PATENTED FEB. 19, 1907.

H. BENZ. ROCK DRILL.

APPLICATION FILED JUNE 2,1905.

SHEETS-SHEET 1,

0 9 l 91 l B. E nr. D E mi N E T A P 5. 0 w 2Y .m .L ZLW TID IRE EDL DKU.CN Hom RM C I L P P A 2. oo 5 4 4. oo nw N wkn @was @Z1 4Q/4% HENRYDEITZ, OF DENVER, COLORADO Specification of Letters Patent.

Patented Feb. 19, 1907.

Application filed June 2, 1905. Serial No.V 263,366.

To all whom it 17mg/ concern:

Be it known that I, HENRY DEITZ, a citizen of the United States,residing at the city andv county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Rock-Drills; and I dodeclare the following to be a full, clear, and' exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

My invention relates to improvements in rock-drills, and consists of thefeatures hereinafter described and claimed, all of which will be fullyunderstood by reference to the accompanying drawings, 1n which isillustrated an embodiment thereof.

In the drawings, Figure 1 is a vertical longitudinal section takenthrough my improved machine. Fig. 2 is a detail view showing thereciprocable yoke, the drillholder, and their connections, the saidparts being shown in the assembled relation. Figs. 3 and 4 are sectionstaken on the lines 3 3 and 4 4, Fig. 1. Fig. 5 is a perspective view indetail of a winged sleeve carried by the drill-holder and engaging therifle-bar for rotating the drill-holder. Fig. 6 is a springplate oryielding device interposed between the wings of the riiie-b ar sleeveand the drillholder. Fig. .7 is a view similar to Fig. 1,y

,but illustrating a modified form of construction.

The same reference characters indicate .the same parts in all the views.

Let the numeral 5 designate the drill-,casing, which may be mounted inany suitable manner. As nothing is claimed 0n the mechanism forsupporting the drill-casing and feeding it back and forth on the suportthese features are not illustrated in the rawings and will only bereferred to in a very eneral way in the specification. This caslng isprovided with a nut 6, adapted to receive a feed-screw, (not shown,)whereby the casing may be moved'back and forth on its support in theordinary way. The caslng 5 is provided at its rear extremity with anenlargement 7, in which is located a yoke 8, provided with a slot 9, inwhich is located a two-part box 10, surrounding the crank 12 of a lshaft13. In the rear of the yoke the casing is provided with a head 14,screwed. theremto. v

The forward extremity of the yoke is provided with a threaded extension15, upon which is screwed a hollow cylindrical member 16, whose forwardextremity is provided with a screw-sleeve 17, engaging a loose collar18, surrounding the drill-holder 19, which is provided with a shoulder19, located in front of the loose collar and forming a stop therefor'.The rear extremity of the drillholder is threaded into a piston 20,located within the cylinder 16.

.The rear part of the piston 20 is provided with a sleeve 21, loosetherein and provided with wings 22, which enter recesses 23 formed inthe rear portion of the piston. Between the winds 22 and one wall ofeach recess 23 is located a spring-plate 24, having a certain degree ofyielding capacity, whereby the winged sleeve may be allowed a partialrotation while the piston remains stationary, as when the drill isstuck, for instance.

The winged sleeve is provided with ribs 26.

adapted to engage the grooves of the ride-bar 27, whereby thedrill-holder is rotated during the rearward movement of the yoke and itscylinder.

The rear extremity of the rifle-bar is made fast to a ratchet 28,located within a casing 29, the latter being provided withrearwardly-projecting lugs 30, adapted toengage counterpart recessesformed in the threaded extension 15 of the yoke, whereby the riebar isprevented'from rotating and made to im art the rotary movement to thedrillho der. 1 This ratchet 28 is engaged by pawls 31, mounted in the'casing 29, the said pawls being acted on by springs 32. prevent theratchet from moving in one direction, but allow it to move freely in theopposite direction.

The rear extremity of the drill-holder is provided with a cavity 33,which the rifiear enters. The drill-holder asses through a screw-plug34, inserted in tlie forward extremity of the casing. The forward orchuck extremity of the drill-holder is provided with a;socket, in whichthe drill-bit`35 is inserted and engaged by a key 36 assing through an oening in the chuck, an entering one of t e longitudinal grooves of thecruciform drill-bit. When the drill, is in place, the key 36 rotrudesbeyond the chuck to engage with a ocking-sleeve 37, having its Thesepawls interior walls tapering. The cavity ofthe sleeve is smallest atthe rear and increases in diameter'forwardly. Hence as the lockingsleeveis moved forwardly it acts on the key to tighten the latter on thedrill-bit.

Immediately in front of the ratchet-casing 29 is locateda disk 38,through which the riIie-bar passes. This diskcloses the chamber of theratchet-casing. Immediately in the rear of the piston is located asmaller disk 39, which surrounds the rifle-bar and closes the recessesof the piston in which the springs 24 are located. Between the disks 38and 39 is located a` coil-spring 40, the said s surrounding therifle-bar. Between the forward extremity-of the piston and the loosecollar 18 is located a coil-spring 41, \Which surrounds thedrill-holder.

The ratchet-casing 29 is connected with the cylindrical member 16 .by asuitable fastening device, as a set-screw 42.

From the foregoing descri tion the use and operation of my im roveconstruction as thus far described will be readily understood. As thecrank-shaft 13 is rotated by connecting the same with any-suitable powerthe yoke -8 is reciprocated within the enlarged rear extremity 7 ofthecasing'. By enlarging the yoke extremity of the casingI am permitted toemploy a larger yoke 6, making a longer stroke possible than with acasing whose rear extremity is the samesize as thebody of the casing.

' As the yoke 1s reclprocated a corresponding movement is imparted tothe c lindrical memberv 16. As the yoke and sai member are drivenforwardly the forward movement is im arted to the piston 20, connected'with the rill-holder as aforesaid. During the initial forward movementof .the yoke and cylinder the spring 40 `is somewhat compressed; vafterwhich thel iston and drillholder are moved forwar y to the limit ofthejyokes stroke. When the-yoke 'andthe cylindrical member cease theirforward movement, the drillholder,.by virtue of its momentum, maycontinue its forward travel,

i whereby the spring 41 is compressed. As

dri

. acting on the soon as the strlkes the rock the recoil of thedrill-holder.' resulting from the force of the blow'will be taken up bythe two sprin s 40 and 41 in a manner that will be readi y understood.Now as the yokeand cylindrical member. move rearwardly the initialmovement compresses the spring 41, which,

iston 20, carries the drillholder rearwar `y with-the cylindrical memberuntil the yoke and the last-named member reach the rearward limit of thestroke permitted by the crank. When this occurs,

the momentum'of the piston 20 and the drillholder carries these partsrearwardly, com- -pressing the s ring' 40. This' rearward movement of lte drill -holder' and piston after the yoke and cylindrical member haveceased their rearward movement is 'sumcient to impart the necessarypartialrotation to the drill-holder by virtue of the engagement of thewinged sleeve 2,1 with the riflebar 27. Assuming now that the drill isstuck in the hole so that the drill-holder cannot turn, if the yoke, thecylindrical member,

and the rifle-bar are reciprocated, vthe rotary element to the.construction, which is desirable-in mechanism ofthislclass.

` 1:1111 thejform ofconstructlon shown` y 7 the yokey 8.v isfprovidedwith an .enlarged screw-threaded extension. 8a, to which is'applied therear extremity of a vplug 8, to which. the cylindrical member 16 isattached, the part 8c closing the rearextremity of the cylinder. In thiscase the threaded extension 8a of the yoke forms the casing for theratchet 28. Betweenv the closed extremity of the cylinder and the piston20 is located an airchamber A, providedrwith an orice B, adapted toregister with an orifice C in the casing when. the parts. are in theposition shown in Fig. 7 or when the cylindrical member is centrallylocated. The forward extremity of the cylinder 16 is closed by a plu D,whichA fitst he drill-holder 19A closely, an is'further provided with apackin -washer E to (prevent,

Vver. Be-

the escape of air aroun the drill-hol tween the plug D and the piston islocated an air-chamber F, communicating with the atmosphere byregistering orifices G and H, formed in the casing and cylinder,respectively. In the -operation of this form of the mechanism as soon asthe yoke and the cylinder 16 begin their forward movement the orifices Band C are immediately thrown out of register, whereby the air cushionsbetweenl the rear head 8 of the cylinder and the pisetween'which IOOI-IS

ton 20, whereby the drill-holder is driven forwardly. As soon asthecylinder reaches its forward limit of movement thedrill-holderisallowed a possible further'forward movement by yirtue ofits momentum, resulting in cushiomn the Xar between the front head ofthe cylin er and the piston, As s'oon as. thel drill-bit strikes therock the recoil of the drill-holder is taken up b the air cushions inthe chambers A and rF, w 'chcushions in this form' of construction takethe place of the springs in the form shown in Figs. 1 and'2.

Having thus described my invention, what I claim is- 1. In a rock-drill,the combination with a casin of a reciprocable yoke located therein, aollow member connected to move with the yoke, a piston located in thehollow member, a drill-holder connected with the piston, a loose collarsurrounding the drill-holder, the latter having a stop to limit theforward movement of the collar thereon, the hollow member also having astop 'for the loose collar forward of the latter, a rifle-bar andratchet carried by the hollow member and connected with thevdrill-holder for rotating the latter, and a yielding connection betweenthe drill-holder piston and the hollow mem ber,` substantially asdescribed.

2. The combination with a casing, a yoke and hollow member rigidlyconnected tolglether and reciprocable m the casing, a drillolderentering the casing and provided with aloose collar surrounding thesame, the drillholder having a sto to limit the forward movement of the`colar thereon, the hollow member having a plu against which the frontend of the loose co lar of the drill-holder bears, a piston located inthe hollow member and connected with the drill-holder, and

cushions located within the hollow member on opposite sides of thedrill-holder piston.

3. The combination with a casing, a member reciprocable in the casing, arifle-bar and ratchet carried by the reciprocable member, a pistonyieldingly connected with the reciprocable member, a drill-holderconnected with the piston, and a winged sleeve carried by the pistonandcoperating with the riflebar to im art the reciprocatin movement to thedrillolder, the piston being recessed to receive the wings of thesleeve, the said recesses beinglarger than the wings, and springsinterposed between the wings and the wal s of the piston-recesses on oneside of the wings,4

the winged sleeve being loose in the piston forthe purpose set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

HENRY DEITZ.

Witnesses:

DENA NELSON, A. J. O'BRIEN.

